Car Stalls At Idle
The engine dies when you stop but runs fine once you are moving. That points at an idle air problem, a dirty throttle body, or a vacuum leak.
What it feels like
- The engine quits the moment you come off the throttle at a light
- The idle drops very low and then catches itself, or does not
- Restarting takes a few tries, then it runs normally
- It happens more when the engine is cold or when the AC is on
Codes that usually produce this
Check these first, in this order
Free checks first. Nothing here costs money except the fuel you burn.
- 1
Watch idle rpm on the scanner and note whether it hunts before it dies.
What you'll seeA steady number near the factory idle. A needle that swings low then quits points at air control.
- 2
Open the hood and look into the throttle body bore at the top of the engine for carbon around the plate edge.
What you'll seeA clean silver bore. A black ring of carbon blocks the small air gap the idle depends on.
- 3
Spray carb cleaner at the intake joints while the engine idles and watch for a change in rpm.
What you'll seeNo change. A brief rise means unmetered air is getting in at that joint.
Stop and get it looked at if
- It stalls while you are moving rather than at a stop.
- The steering goes heavy, which means the engine quit entirely.
- It will not restart at all.